It's a 2 way street....the expats are there as it was a better option then they were facing at home. The local Qataris can not do it by themselves...there just isn't enough people in the country. I think a little mutual respect goes a long way. If they treat people poorly they attract a poorer quality of pilot.
However as long as they honor the contract you signed they can be as generous as they want with their own people and it shouldn't change things.
I see one problem it does cause is inflation....if everybody starts making more money there is a certain amount of inflation....cars, homes, schools etc....all are getting more costly and the housing and school allowance is inadequate.